| #ifndef _LINUX_IRQ_H |
| #define _LINUX_IRQ_H |
| |
| /* |
| * Please do not include this file in generic code. There is currently |
| * no requirement for any architecture to implement anything held |
| * within this file. |
| * |
| * Thanks. --rmk |
| */ |
| |
| #include <linux/smp.h> |
| |
| #ifndef CONFIG_S390 |
| |
| #include <linux/linkage.h> |
| #include <linux/cache.h> |
| #include <linux/spinlock.h> |
| #include <linux/cpumask.h> |
| #include <linux/irqreturn.h> |
| |
| #include <asm/irq.h> |
| #include <asm/ptrace.h> |
| #include <asm/irq_regs.h> |
| |
| struct irq_desc; |
| typedef void fastcall (*irq_flow_handler_t)(unsigned int irq, |
| struct irq_desc *desc); |
| |
| |
| /* |
| * IRQ line status. |
| * |
| * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h |
| * |
| * IRQ types |
| */ |
| #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */ |
| #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */ |
| #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */ |
| #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) |
| #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */ |
| #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */ |
| #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */ |
| #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */ |
| |
| /* Internal flags */ |
| #define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */ |
| #define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */ |
| #define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */ |
| #define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */ |
| #define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */ |
| #define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */ |
| #define IRQ_LEVEL 0x00004000 /* IRQ level triggered */ |
| #define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */ |
| #define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */ |
| #define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */ |
| #define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */ |
| #define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */ |
| #define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */ |
| #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */ |
| #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */ |
| |
| #ifdef CONFIG_IRQ_PER_CPU |
| # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) |
| # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) |
| #else |
| # define CHECK_IRQ_PER_CPU(var) 0 |
| # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING |
| #endif |
| |
| struct proc_dir_entry; |
| struct msi_desc; |
| |
| /** |
| * struct irq_chip - hardware interrupt chip descriptor |
| * |
| * @name: name for /proc/interrupts |
| * @startup: start up the interrupt (defaults to ->enable if NULL) |
| * @shutdown: shut down the interrupt (defaults to ->disable if NULL) |
| * @enable: enable the interrupt (defaults to chip->unmask if NULL) |
| * @disable: disable the interrupt (defaults to chip->mask if NULL) |
| * @ack: start of a new interrupt |
| * @mask: mask an interrupt source |
| * @mask_ack: ack and mask an interrupt source |
| * @unmask: unmask an interrupt source |
| * @eoi: end of interrupt - chip level |
| * @end: end of interrupt - flow level |
| * @set_affinity: set the CPU affinity on SMP machines |
| * @retrigger: resend an IRQ to the CPU |
| * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ |
| * @set_wake: enable/disable power-management wake-on of an IRQ |
| * |
| * @release: release function solely used by UML |
| * @typename: obsoleted by name, kept as migration helper |
| */ |
| struct irq_chip { |
| const char *name; |
| unsigned int (*startup)(unsigned int irq); |
| void (*shutdown)(unsigned int irq); |
| void (*enable)(unsigned int irq); |
| void (*disable)(unsigned int irq); |
| |
| void (*ack)(unsigned int irq); |
| void (*mask)(unsigned int irq); |
| void (*mask_ack)(unsigned int irq); |
| void (*unmask)(unsigned int irq); |
| void (*eoi)(unsigned int irq); |
| |
| void (*end)(unsigned int irq); |
| void (*set_affinity)(unsigned int irq, cpumask_t dest); |
| int (*retrigger)(unsigned int irq); |
| int (*set_type)(unsigned int irq, unsigned int flow_type); |
| int (*set_wake)(unsigned int irq, unsigned int on); |
| |
| /* Currently used only by UML, might disappear one day.*/ |
| #ifdef CONFIG_IRQ_RELEASE_METHOD |
| void (*release)(unsigned int irq, void *dev_id); |
| #endif |
| /* |
| * For compatibility, ->typename is copied into ->name. |
| * Will disappear. |
| */ |
| const char *typename; |
| }; |
| |
| /** |
| * struct irq_desc - interrupt descriptor |
| * |
| * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] |
| * @chip: low level interrupt hardware access |
| * @msi_desc: MSI descriptor |
| * @handler_data: per-IRQ data for the irq_chip methods |
| * @chip_data: platform-specific per-chip private data for the chip |
| * methods, to allow shared chip implementations |
| * @action: the irq action chain |
| * @status: status information |
| * @depth: disable-depth, for nested irq_disable() calls |
| * @wake_depth: enable depth, for multiple set_irq_wake() callers |
| * @irq_count: stats field to detect stalled irqs |
| * @irqs_unhandled: stats field for spurious unhandled interrupts |
| * @lock: locking for SMP |
| * @affinity: IRQ affinity on SMP |
| * @cpu: cpu index useful for balancing |
| * @pending_mask: pending rebalanced interrupts |
| * @dir: /proc/irq/ procfs entry |
| * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP |
| * @name: flow handler name for /proc/interrupts output |
| * |
| * Pad this out to 32 bytes for cache and indexing reasons. |
| */ |
| struct irq_desc { |
| irq_flow_handler_t handle_irq; |
| struct irq_chip *chip; |
| struct msi_desc *msi_desc; |
| void *handler_data; |
| void *chip_data; |
| struct irqaction *action; /* IRQ action list */ |
| unsigned int status; /* IRQ status */ |
| |
| unsigned int depth; /* nested irq disables */ |
| unsigned int wake_depth; /* nested wake enables */ |
| unsigned int irq_count; /* For detecting broken IRQs */ |
| unsigned int irqs_unhandled; |
| spinlock_t lock; |
| #ifdef CONFIG_SMP |
| cpumask_t affinity; |
| unsigned int cpu; |
| #endif |
| #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) |
| cpumask_t pending_mask; |
| #endif |
| #ifdef CONFIG_PROC_FS |
| struct proc_dir_entry *dir; |
| #endif |
| const char *name; |
| } ____cacheline_aligned; |
| |
| extern struct irq_desc irq_desc[NR_IRQS]; |
| |
| /* |
| * Migration helpers for obsolete names, they will go away: |
| */ |
| #define hw_interrupt_type irq_chip |
| typedef struct irq_chip hw_irq_controller; |
| #define no_irq_type no_irq_chip |
| typedef struct irq_desc irq_desc_t; |
| |
| /* |
| * Pick up the arch-dependent methods: |
| */ |
| #include <asm/hw_irq.h> |
| |
| extern int setup_irq(unsigned int irq, struct irqaction *new); |
| |
| #ifdef CONFIG_GENERIC_HARDIRQS |
| |
| #ifndef handle_dynamic_tick |
| # define handle_dynamic_tick(a) do { } while (0) |
| #endif |
| |
| #ifdef CONFIG_SMP |
| static inline void set_native_irq_info(int irq, cpumask_t mask) |
| { |
| irq_desc[irq].affinity = mask; |
| } |
| #else |
| static inline void set_native_irq_info(int irq, cpumask_t mask) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_SMP |
| |
| #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) |
| |
| void set_pending_irq(unsigned int irq, cpumask_t mask); |
| void move_native_irq(int irq); |
| void move_masked_irq(int irq); |
| |
| #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */ |
| |
| static inline void move_irq(int irq) |
| { |
| } |
| |
| static inline void move_native_irq(int irq) |
| { |
| } |
| |
| static inline void move_masked_irq(int irq) |
| { |
| } |
| |
| static inline void set_pending_irq(unsigned int irq, cpumask_t mask) |
| { |
| } |
| |
| #endif /* CONFIG_GENERIC_PENDING_IRQ */ |
| |
| extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask); |
| extern int irq_can_set_affinity(unsigned int irq); |
| |
| #else /* CONFIG_SMP */ |
| |
| #define move_native_irq(x) |
| #define move_masked_irq(x) |
| |
| static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int irq_can_set_affinity(unsigned int irq) { return 0; } |
| |
| #endif /* CONFIG_SMP */ |
| |
| #ifdef CONFIG_IRQBALANCE |
| extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask); |
| #else |
| static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_AUTO_IRQ_AFFINITY |
| extern int select_smp_affinity(unsigned int irq); |
| #else |
| static inline int select_smp_affinity(unsigned int irq) |
| { |
| return 1; |
| } |
| #endif |
| |
| extern int no_irq_affinity; |
| |
| static inline int irq_balancing_disabled(unsigned int irq) |
| { |
| return irq_desc[irq].status & IRQ_NO_BALANCING_MASK; |
| } |
| |
| /* Handle irq action chains: */ |
| extern int handle_IRQ_event(unsigned int irq, struct irqaction *action); |
| |
| /* |
| * Built-in IRQ handlers for various IRQ types, |
| * callable via desc->chip->handle_irq() |
| */ |
| extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc); |
| extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); |
| extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc); |
| extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc); |
| extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc); |
| extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc); |
| |
| /* |
| * Monolithic do_IRQ implementation. |
| * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly) |
| */ |
| #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
| extern fastcall unsigned int __do_IRQ(unsigned int irq); |
| #endif |
| |
| /* |
| * Architectures call this to let the generic IRQ layer |
| * handle an interrupt. If the descriptor is attached to an |
| * irqchip-style controller then we call the ->handle_irq() handler, |
| * and it calls __do_IRQ() if it's attached to an irqtype-style controller. |
| */ |
| static inline void generic_handle_irq(unsigned int irq) |
| { |
| struct irq_desc *desc = irq_desc + irq; |
| |
| #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
| desc->handle_irq(irq, desc); |
| #else |
| if (likely(desc->handle_irq)) |
| desc->handle_irq(irq, desc); |
| else |
| __do_IRQ(irq); |
| #endif |
| } |
| |
| /* Handling of unhandled and spurious interrupts: */ |
| extern void note_interrupt(unsigned int irq, struct irq_desc *desc, |
| int action_ret); |
| |
| /* Resending of interrupts :*/ |
| void check_irq_resend(struct irq_desc *desc, unsigned int irq); |
| |
| /* Enable/disable irq debugging output: */ |
| extern int noirqdebug_setup(char *str); |
| |
| /* Checks whether the interrupt can be requested by request_irq(): */ |
| extern int can_request_irq(unsigned int irq, unsigned long irqflags); |
| |
| /* Dummy irq-chip implementations: */ |
| extern struct irq_chip no_irq_chip; |
| extern struct irq_chip dummy_irq_chip; |
| |
| extern void |
| set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, |
| irq_flow_handler_t handle); |
| extern void |
| set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, |
| irq_flow_handler_t handle, const char *name); |
| |
| extern void |
| __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, |
| const char *name); |
| |
| /* |
| * Set a highlevel flow handler for a given IRQ: |
| */ |
| static inline void |
| set_irq_handler(unsigned int irq, irq_flow_handler_t handle) |
| { |
| __set_irq_handler(irq, handle, 0, NULL); |
| } |
| |
| /* |
| * Set a highlevel chained flow handler for a given IRQ. |
| * (a chained handler is automatically enabled and set to |
| * IRQ_NOREQUEST and IRQ_NOPROBE) |
| */ |
| static inline void |
| set_irq_chained_handler(unsigned int irq, |
| irq_flow_handler_t handle) |
| { |
| __set_irq_handler(irq, handle, 1, NULL); |
| } |
| |
| /* Handle dynamic irq creation and destruction */ |
| extern int create_irq(void); |
| extern void destroy_irq(unsigned int irq); |
| |
| /* Test to see if a driver has successfully requested an irq */ |
| static inline int irq_has_action(unsigned int irq) |
| { |
| struct irq_desc *desc = irq_desc + irq; |
| return desc->action != NULL; |
| } |
| |
| /* Dynamic irq helper functions */ |
| extern void dynamic_irq_init(unsigned int irq); |
| extern void dynamic_irq_cleanup(unsigned int irq); |
| |
| /* Set/get chip/data for an IRQ: */ |
| extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); |
| extern int set_irq_data(unsigned int irq, void *data); |
| extern int set_irq_chip_data(unsigned int irq, void *data); |
| extern int set_irq_type(unsigned int irq, unsigned int type); |
| extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); |
| |
| #define get_irq_chip(irq) (irq_desc[irq].chip) |
| #define get_irq_chip_data(irq) (irq_desc[irq].chip_data) |
| #define get_irq_data(irq) (irq_desc[irq].handler_data) |
| #define get_irq_msi(irq) (irq_desc[irq].msi_desc) |
| |
| #endif /* CONFIG_GENERIC_HARDIRQS */ |
| |
| #endif /* !CONFIG_S390 */ |
| |
| #endif /* _LINUX_IRQ_H */ |